the older systems have the secondary valves in the runners. you can take them out and plug the hole on the side of the manifold with jb weld. and or you can switch to a newer s14 manifold that doesn't have them.

check out the free mod section brother you will see more about it.

 

i believe the manifolds are exaclty the same except for the butterflys and the vacuum nipples that operate the butterflys.... the best option would be to port out the s14 manifold with a ported out throttlebody and remove all the emissions ..... and last but not least try out the new thermal gaskets... since you will need a new gasket anyways... all of this total should increase about 5 hp or maybe even more im just low ballin cause i dunno for sure.... dyno before and after

 

sweet. thats pretty kool right there. Makes me feel like the s14 motor might come into more use than i thought. I was outside earlier when i got off work (9am) and took all the emission crap and vacuum lines off. My question is.....which lines, if any-do i have to route for vacuum?? and/or which ones to cap off?? i hav a box of vacuum caps in all kinds of sizes, figured it'd help again(used them when i removed the AVI system). I deff lik how clean it looks without that crap in there. thanks guys

 

well i know if you search there is a write up on what emission stuff to remove and how to do it and plus shows u how to clean up your intake and make it look brand new... hope that helps... i'd help more but i still gotta do this to my s14 lol
Eric

 

yea check out the free mod thread bro.... all the info is there.. no point in reproducing it. if you have any questions, ask it there. the s14 mani is better... has more vac sources. Each one of my turbo items that needed a vac has its own source which was basically my boost gauge and BOV.

 

here i'll help u a little cause im bored lol

its on 240sx . org under mods emissions removal

 

hell yeah man. that was siiiick. you are the man for that one....crap was so step by step and pretty detailed. Had the mani in front on me the whole time jus following with the steps. thanks dude

 

no prob i figured that would help you out greatly verus going in blind folded and not knowing what to remove or keep..... oh and your welcome anytime bro...

 

aw hell yea dude. as soon as i got to lookin at the site i knew it was a good one. Sent it str8 to the favs. Bout to do the sidemarker to turn signal "swap" courtesy of them for that JDM flava...hellz to the yea bro

 

yeah they have just about every write up or walk thru around... for both s13 and s14 lots of info....